Here’s Maya reading real-time input from an Arduino board, set up in the circuit from the Arduino Button tutorial, and assuming the environment setup from my first Arduino post:

I’ve tweaked the code for the video to make the readout easier to see.

Code follows:

Arduino code

// Serial button, modified from Tom Igoe's Button script at
// http://www.arduino.cc/en/Tutorial/Button

 const int buttonPin = 2;     // the number of the pushbutton pin
 const int ledPin =  13;      // the number of the LED pin
 int buttonState = 0;         // variable for reading the pushbutton status

 void setup() {
   // initialize the LED pin as an output:
   pinMode(ledPin, OUTPUT);
   // initialize the pushbutton pin as an input:
   pinMode(buttonPin, INPUT);
   Serial.begin(9600);        // connect to the serial port
 }

 void loop(){
   // read the state of the pushbutton value:
   buttonState = digitalRead(buttonPin);
   // check if the pushbutton is pressed.
   // if it is, the buttonState is HIGH:
   if (buttonState == HIGH) {
     // turn LED on:
     digitalWrite(ledPin, HIGH);
     Serial.print("1");
   }
   else {
     // turn LED off:
     digitalWrite(ledPin, LOW);
     Serial.print("0");
   }
   delay(100); // update 10 times a second
 }
//

Maya Python code

## simple button read
import time
import sys
sys.path.append( "C:\Program Files\Common Files\Python\Python25\Lib\site-packages\win32")
import win32file
sys.path.append( "C:\Program Files\Common Files\Python\Python25\Lib\site-packages\win32\lib")
import win32con
import serial

ser = serial.Serial(
  port='COM3',
  baudrate=9600,
  parity=serial.PARITY_NONE,
  stopbits=serial.STOPBITS_ONE,
  bytesize=serial.EIGHTBITS
)

startTime=timerX()
totalTime = timerX(startTime=startTime)

while totalTime < 5: # 5-second timer prevents infinite loop
  print ser.read()
  totalTime = timerX(startTime=startTime)

ser.close()
##

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This entry was posted on Monday, July 27th, 2009 at 5:01 pm and is filed under Arduino, Code, Python, Tech. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.